#include <stdio.h>
int my_strlen(char*arr)
{
	int b = 0;
	while (*arr != '\0')
	{
		b++;
		arr++;
	}
	return b;
}
int main()
{
	char arr[] = "abcdef";
	int a = my_strlen(arr);
	printf("%d", a);

	return 0;
}